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President Joe Biden’s Covid-19 Response Team holds a press conference Wednesday on the coronavirus pandemic that infected more than 28 million Americans and killed at least 516,616 people in just over a year.

On Tuesday, Biden announced that the U.S. will have sufficient supplies of Covid-19 vaccines to vaccinate every adult in the nation by the end of May – two months earlier than expected. He also called on states to prioritize vaccinating teachers and school staff against Covid-19, with the aim of giving at least one shot to every educator and staff member across the country by the end of March.

“Let me be clear, we can reopen schools if the right steps are taken before staff are vaccinated,” Biden said at the White House on Tuesday. “But time and again we have heard from educators and parents who are concerned about it.”

Read CNBC’s live updates for the latest news on the Covid-19 outbreak.

–CNBC’s Will Feuer contributed to this report.